Unconformities play a
crucial role in reconstructing the geologic history of
a location. They provide a distinct time boundary, separating events that occurred before
versus after the unconformity.

Rotate the block below to
examine the moderately tilted layers below
the unconformity. Then reveal what the unconformity (top face of the
tilted, older layers) would look like by removing the horizontal, younger layers above the
unconformity.